What is the difference from the toilets that we press the button straight from the wall or the one that there is a box behind the seat? Is there anything to do with p an s traps?
Thanks.

What is the difference from the toilets that we press the button straight from the wall or the one that there is a box behind the seat? Is there anything to do with p an s traps?
thanks.
The button works from pressure and the box works from gravity. The bowl has a built in trap. Neither one has anything to do with a external "P" or "S" trap . Regards, Tom